This is a great thread!
I should take this opportunity to mention something I mentioned in another thread a few days ago. I recently purchase a rather expensive new DVR, and unfortunately, the forces of nature wouldn't allow it to work properly. What I noted, though, was the great customer service I got from three companies.
Comcast truly went the extra mile. This is a device that basically represents a lot of lost revenue to them -- if it worked, I would have been paying them about $20 less per month, and really, probably, may very well have cut my Comcast service down by $45 per month. Yet, they jumped through hoops to try to help me get it working. It was very evident that they weren't dragging their feet or doing anything to contribute to the failure of the device, which isn't impressive really -- you'd expect that. What was impressive was just how fare beyond the call they went to try to get it to work. And courteous, polite, helpful, accommodating. In the end, despite all the work they did, and at least some indications that it probably wasn't their fault, they still refunded me the service charges for the work they did do, no questions asked.
TiVo wasn't quite as good. Their technical support folks were pretty surly for the most part, except for the last one who really listened and tried to help, and finally gave me a clear indication that yes perhaps there is a problem (though he couldn't tell if it was on his end or on Comcast's end). Their billing people, though, were gems. Because the device didn't work and then worked and then didn't work and then worked and then didn't work, I kept switching back and forth between paying, refunding, paying, refunding, etc. They never grumbled. They were very polite, friendly, and even commiserated with my situation, even after the second time they had to reverse the charges.
Finally Circuit City. They didn't have very much to do, in this case, but they did it well. I walked in. Told them it didn't work despite several attempts with tech support. And they refunded my money without a further question.